煤矸石对水泥熟料水化促进作用及机理(英文)

EFFECT OF GANGUE ON HYDRATION PROCESS OF PORTLAND CEMENT

通过测试化学结合水量及用背散射电子图像分析法测试水泥熟料水化程度,研究了煤矸石–水泥混合体系中煤矸石对水泥熟料水化的促进作用,并通过对Ca(OH)2含量测试分析了其作用机理。结果表明:煤矸石的掺入促进了混合体系中水泥熟料的水化进程,且活性越高,掺量越大,促进水泥效果越明显;水化早期煤矸石对水泥熟料水化的促进作用主要来源于简单"稀释"作用(物理作用),水化中后期具有较高活性的活化煤矸石通过自身反应活性发挥吸收体系中Ca(OH)2促进水泥熟料水化(化学作用)。

Two kinds of gangue with different hydration activities,namely,original gangue and activated gangue,were blended in cement paste,respectively.The effects of gangue on the hydration process of Portland cement clinker in gangue-cement blend were investigated via a non-evaporable water content test and cement clinker hydration degree determined by a backscatter electron imagine analysis.Furthermore,the mechanism for the effect of gangue was discussed.The results indicate that both of the two gangues can accelerate cement clinker hydration process.This accelerated effect can be due to the physical and chemical effects.The original gangue can enhance the hydration process by dilution at early ages,and the activated gangue can increase the pozzolanic reaction at later ages.The activated gangue can accelerate the cement hydration process more remarkably than the original gangue.